Atmosphere

• Thin layer of air that forms a protective covering around the planet

Conduction

• Transfer of thermal energy when molecules bump into each other, direct contact between substances

Wind

• Movement of air from an area of higher pressure to an area of lower pressure

Humidity

• Amount of water vapor present in the air

Front

• A boundary between two air masses of different density, temperature, or moisture

Hurricane

• Large, swirling low-pressure system that forms over the warm Atlantic Ocean

Convection

• Transfer of thermal energy by the flow of a fluid (liquid or gas)

Anemometer• An instrument

that measures the speed of wind.

Psychrometer• An instrument

that measures atmospheric humidity.